Arduino (e.g., Uno, Mega, etc.) RFID Reader (e.g., RC522) RFID Tags or Cards LCD Display (optional, for showing status) Breadboard and Jumper Wires Reads the card UID when a new card is present.

Therefore, an effort was made to design a tool for “identification of impedance changes in metals using an Arduino Uno-based RFID RC522” which is relatively inexpensive and easy to carry.

I just received my RC522 RFID reader and made this simple Arduino access control system that uses the reader, a buzzer for the alarm and a relay shield for the security system. The relay can be used ...